I had two periods last month of January, and about 5days after I finished my second period (they were a week appart) my boyfriend and I had unprotected sex, he came inside me and that was 4 weeks ago, I have yet to have a period, I have been extremely tired a lot having random mood swings where I go from laughing to getting angry then crying and right back to happy, I am going to the bathroom every hour, almost always hungry but then when I lay down I feel extremely bloated, and recently I was taking a bath and only my stomach couldn't get comfortable and if I sleep in a certain position I get really nauseous, I get that way too when I've tried to drink coffee and alcohol recently... I have taken two home pregnancy test and both said right away "not pregnant" is it too soon to tell or is this just a bad PMS coming?

It's too early to test. Wait until your period is at least 2 weeks overdue and then test with first morning urine. If that test is negative wait until your next period is due. If you miss it, test again or get a blood test.